Reem fought strangely in that fight, he came out so recklessly against Ngannou, he should of fought from a distance and taken it slow. Ngannou's cardio is a question mark, he should of tried to test it.
If a guy is longer and faster than you, you can't take it slow.
Taking it slow works when you can stay outside of the other guy's range.
If you take it slow against someone longer and faster and try to stay outside their range, all you do is put them exactly where they want you to be: eating their straights while you can't do anything back but look at them.
I only know this because I'm short and I can't "take it slow" against anyone. I have to constantly be pressuring. It makes sparring suck because sparring is commonly done at 50% and you can't really pressure someone at 50%. Longer guys can throw quick straights at 50% power and just stop them at the end. To get inside, you have to use enough muscles to move your body quick, and moving your body means you're putting your power into punches, which you can't do in sparring too much.
If I try to 'take it slow', I just stare at them while they're annihilating me with jabs and crosses and all I can physically do is look at them.
Overeem had to pressure Ngannou and I think his plan was to pressure and grapple. Problem: Ngannou is so strong he gets standing kimuras on 260 lb guys.
Ngannou's length, speed, and strength makes him a nightmare matchup for a lot of the same reasons Jones is. Try to stay outside and play it tactically, you're at the end of the fastest guy in the division's 84" reach. Try to get inside, you're getting clinched by a 6'5" guy who also happens to be the strongest guy in the division.
Physically, he's like Jon Jones with Rumble's KO power.
Jones doesn't have Ngannou's power. However, he's also a 5 round fighter. It remains to be seen if Ngannou's power limits him to being a 2 round fighter.